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as root. If you see x86_64 as part of the output, it's a 64 bit OS. 32 v 64 bit means a larger address space. It's not necessarily faster. You can address larger amts of RAM more easily, see http://kbase.redhat.com/faq/docs/DOC-6571
You can get all 32-bit apps to run on a 64-bit system. You can't get all 64-bit apps to run on on a 32-bit system. If you are running 'Oracle Enterprise linux 64bit version' then you have a 64-bit system. I would stick with it. Otherwise, performance would take a hit.
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